Derrick



F. T. CLIFFORD April :17, 1945.

DERRICK Filed May 15, 1944 2 Sheets-Sheet l April 1945- F. T. CLIFFORD I7 Q DERRICK Filed May 15, 1944 2 Sheets-Sheet 2 Patented Apia 17, 1945 hClifford, LewistongiMaine Application ltiay 15,l isaaifnam dfflioiaim.(Citizn rt Y 4 inventiomrelates to: a'icranefand moreespeciallyto a'jhoisting derrick.

" *The'priina'ry 'obje'ct'ofthe invent on isthejproa canbe-anchored inplace, and. its upright support can be brought into a plumb positionregardless of the surface elevation upon whichthe. same is set, and suchderrick is readily and easily oper iS n like, having. at it atedgiforloading andpunloading purposes with minimum manual labor in the workingthereof.

'A further object of the invention is the provision of a derrick of thischaracter. wherein the construction thereof involves few parts, it beinghandled with dispatch, and is assured of a maximum lifting capacity witha minimum of manual exertion on the part of an operator.

A still further object of the invention is the provision of a derrick ofthis character, which is simple in construction, thoroughly reliable andeflicient in operation, strong, durable, readily and easily rected andknocked down, easily operated, and inexpensive to manufacture andinstall.

With these and other objects in view the invention consists in thefeatures of construction, combination'and arrangement of parts as willbe hereinafter more fully described, illustrated in the accompanyingdrawings, which show the preferred and modified forms of constructionthereof, and pointed out in the claims hereunto ap-. pended.

In the accompanying drawings:

Figure 1 is a side elevation, partly broken away,

of a derrick constructed in accordance with the invention, theadjustable head bracket being shown by full lines in one position and bydotted lines in an adjusted position.

Figure 2 is a fragmentary top plan view of the derrick as shown inFigure 1. 1

Figure 3 is a sectional view taken on the line 3-3 of Figure 1 lookingin the direction of the arrows. I

Figure 4 is a sectional view taken on the line 44 of Figure 3 looking inthe direction of the arrows.

Figure 5 is a sectional view taken-on the line 55 of Figure 1' lookingin the direction of the arrows.

nates generally a crane or 3 Figure 6 is aldetail sectionalview takenonthe line; 6 -:6 of v Figure I looking. in; the direction ,of. thearrows.

Similar reference characters indicate corresponding parts throughout theseveral views in thedrawings. I a

' eferring to in de I derrick 'constructed in accordance with the.invention, comprising a main upright or vertical standard, l 0, posterthe I lower end'a' tongue, and roove fitting'li witha laterallye'xtending base sill l2, which-f is disposed at substantially right.angles to its normal vertical positionwhen risingjirom a foundation orthe groundrThis sill l2 at the at! dawag's end next to the standard I0is slightly projected beyondsthe-yertical planeof thelatte'r. Fittedwith thestandard l0 and the sill I2 is a laterally inclined brace bar l3which has its ends next thereto matched beveled and secured thereto bynut-carrying bolts M, the heads l5 of the latter being countersunk inthe said bar l3.

At substantially right angles to the lay of the sill l2 and fitted tothe standard It! is a plumbing leg frame involving the leg rail "5 andan adjustable horizontally disposed brace rail 11, respectively, the legrail being outwardly inclined to the vertical, and at its upper end haspivotal connection at [8 between a pair of coupling plates 19 and 20,respectively, beyond the upper end of the standard In, these platesbeing transversely bolted at 2| to opposite sides of such standard.

For a distance along the lower portion of this rail I6 is provided aseries of spaced bolt holes 22 selectively accommodating a coupling bolt23 fitting an attaching plate 24 fastened at 25 to the end next to saidrail of the rail II, which at the other end of the latter is fitted anangle piece 26 having connection by a bolt 21 to the standard I0. Itshould be seen that by making minor adjustments between the rails 1-6and I1, this makes possible to bring the standard [0 in a plumbposition, vation upon which the derrick is set.

On the side of the standard l0 opposite to the positionof the lateralsill l2 and the brace bar [3, at the uppermost portion of said standard,is a swingable cable hoisting head bracket involving an invertedsubstantially L-shaped hanger 28, its vertical branch forming a turningstem '28, while its horizontal branch 30 constitutes a pulley supporthaving inner and outer bearings 3| for pulleys 32, the stem 29 beingequipped with balk-bearing fittings with a lower mounting 33 on thestandard Ill, and the upper ail. A desig regardless of the surfaceeleend of such stem has a pivot pin fitting 34 with an outturned bearingear-'35 on the plate 20, and in this manner the head bracket can swin ina horizontal path in an arcuate direction at one side of the standardIf! for load changing positions.

Trained over the pulleys 32 is a hoisting cable 36 or the like, and thelatter carries a load hook 31 at the lifting end thereof. This cable 36can be manually or mechanically operated, which is optional with theuser of the derrick A.

The head bracket has unitary therewith a brace 38 which joins thebranches of this bracket, and the brace loosely carrie a latching hook39 to engage a keeper eye 40 stationarily held on the brace bar l3 ofthe sill I 2, so that the head brackat can be held against movement whenin one position, as will appear in Figure 2 of the drawings.

The pin 34 is held secure by a retaining key 4| engaged therewith andfitting the standard H! of the derrick.

The head bracket connection with the standard as described and shown maybe modified, if found desirable. The pin 34 is socketed in the stembranch of the bracket, as is shown in Figure 4 of the drawings.

From the foregoing it is thought that the construction and manner ofoperation of the derrick will be clearly understood,and therefore, amore extended explanation has been omitted for the sake of brevity.

Changes, variations and modifications of the invention may be resortedtoas fall properly within the scope of the claim hereunto appended,

relation to the frame.

without departing from the spirit of the said invention, or sacrificingany of its advantages.

What is claimed is: A portable knockdown derrick having a two pointballast comprising, a main upright formstantially right angles to thesill and having a horizontal brace rail and an inclined leg rail,respectively, a pivot detachably connecting the leg rail to the uprightin bridging relation to its uppermost end, said leg rail having spacedholes intermediate of its ends, a detachable fastener on the brace railand selectively engaging the holes for plumbing the upright by saidframe, an inverted substantially L-shaped hanger located opposite to theposition of the longer portion of the sill and next to the pivoted endof the leg rail, brackets fixed to the upright for accommodating thehanger therebetween, a pivot pin at the lower end of the hanger andremovably engaging the bracket next thereto, a pivot pin removablyinterfitting the other bracketnext to the uppermost end of the uprightand detachably inserted and socketed in the hanger with the latter freeto swing arcuately to a distance substantially one-half of a circle, theleg frame and sill being effective as a two point ballast to the uprightin opposition to the hanger, and means for holding the hanger fixed inparallel FRED T. CLIFFORD.

